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Boston bombings: NYPD, MTA heightens security

MTA police conduct a random inspection on a bag belonging to Joseph Bailey, 42, of Mount Vernon, at the Metro-North Railroad station in White Plains. Security has been heightened at many stations across the region in the wake of the attacks at the Boston Marathon. (April 16, 2013) Photo Credit: Xavier Mascarenas

MTA police conduct a random inspection on a bag belonging to Joseph Bailey, 42, of Mount Vernon, at the Metro-North Railroad station in White Plains. Security has been heightened at many stations across the region in the wake of the attacks at the Boston Marathon. (April 16, 2013)

Photo Credit: Xavier Mascarenas

An MTA police K-9 unit patrols the Metro-North Railroad station in White Plains. Security has been heightened at many stations across the region in the wake of the attacks at the Boston Marathon. (April 16, 2013)

Photo Credit: Getty Images

A police K-9 unit stands by as train passengers pass through Penn Station in Manhattan. Police were out in force throughout the city, a day after explosions near the finish line of the Boston Marathon killed 3 people and wounded more than 170 others. (April 16, 2013)

Photo Credit: Getty Images

A police K-9 unit stands by as train passengers pass through Penn Station in Manhattan. Police were out in force throughout the city, a day after explosions near the finish line of the Boston Marathon killed 3 people and wounded more than 170 others. (April 16, 2013)

Photo Credit: AP

Police officers keep an eye on commuters in a subway station in Manhattan. (April 16, 2013)

Photo Credit: AP

Police officers keep an eye on commuters in the subway in Manhattan. (April 16, 2013)

Photo Credit: Getty Images

A police K-9 unit stands by as passengers line up to board an Amtrak train at Penn Station in Manhattan. (April 16, 2013)

Photo Credit: Getty Images

A police K-9 unit stands by outside of Penn Station in Manhattan. (April 16, 2013)

Photo Credit: Getty Images

New York Police Department officers inspect bags at a subway entrance during the morning commute in Grand Central Terminal in New York City. (April 16, 2013)

Photo Credit: Getty Images

National Guard soldiers keep watch during the morning commute in Grand Central Terminal in New York City. (April 16, 2013)

A National Guard soldier keeps watch during the morning commute in Grand Central Terminal in New York City. (April 16, 2013)

Photo Credit: Xavier Mascarenas

A passenger's bag is randomly inspected by MTA police at the Metro-North Railroad station in White Plains. Security has been heightened at many stations across the region in the wake of the attacks at the Boston Marathon. (April 16, 2013)

Photo Credit: Getty Images

New York Police Department officers inspect bags at a subway entrance during the morning commute in Grand Central Terminal in Manhattan. (April 16, 2013)

A couple, who did not want to be identified, read a newspaper while waiting for a train at the Metro-North Railroad station in White Plains. Security has been heightened at many stations across the region in the wake of the attacks at the Boston Marathon. (April 16, 2013)

Photo Credit: Xavier Mascarenas

Tony Bruce, 53, of Brewster, was on his way to work at the World Trade Center in Manhattan during the 9/11 attacks. Bruce waits for a train to Grand Central Terminal while at the Metro-North Railroad station in White Plains. Security has been heightened at many stations across the region in the wake of the attacks at the Boston Marathon. (April 16, 2013)

Photo Credit: AP

Amtrak police officers and their dogs watch as commuters walk through Penn Station in Manhattan. The deadly explosions at the Boston Marathon on Monday reverberated on both sides of the Atlantic as cities from Los Angeles to London saw a surge in security. (April 16, 2013)

Photo Credit: Getty Images

New York Police Department officers gather in Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

Police officers man their post at Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Lili Holzer-Glier

Police presence is increased at the New Rochelle train station after two bombs went off near the finish line of the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

New York Police Department officers gather at the edge of Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

A police officer is at his post at Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

A police officer mans his post at Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

A news banner in Manhattan announces casualties after blasts occurred near the finish line of the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

New York Police Department officers gather at the edge of Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

New York Police Department officers gather at the edge of Times Square in Manhattan as the city heightens security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

A police officer and his K-9 companion keep guard as a Long Island Rail Road train from New York City arrives at the station in Hicksville. Police departments in many cities beefed up security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

A police officer and his K-9 companion keep guard as a Long Island Rail Road train from Manhattan arrives at the station in Hicksville. Police departments in many cities beefed up security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: Getty Images

A police officer and his K-9 companion keep guard as a Long Island Rail Road train from New York City arrives at the station in Hicksville. Police departments in many cities beefed up security measures in response to the bombings at the Boston Marathon. (April 15, 2013)

Photo Credit: AP

A New Jersey State Police helicopter flies by the construction site of One World Trade Center in lower Manhattan as seen from Jersey City. New York has beefed up security in the wake of explosions near the finish line at the Boston Marathon. (April 15, 2013)

Photo Credit: Craig Ruttle

Police presence as seen in the Times Square area of Manhattan in response to a bombing near the finish line of the Boston Marathon. (April 15, 2013)

Photo Credit: Craig Ruttle

An NYPD cruiser scrolls terror alert information and phone numbers on an electronic display as police presence is seen in the Times Square area of Manhattan in the wake of a bombing near the finish line of the Boston Marathon. (April 15, 2013)